<template>
  <div class="bottom-menu">
    <checkButton class="select-all" :is-checked="isSelectAll" @click.native="checkClick" />
    <span>全选</span>
    <span class="total-price">合计: ¥{{ totalPrice }}</span>
    <span class="buy-product" @click="calcClick">去计算 ({{ checkLength }})</span>
  </div>
</template>

<script>
import CheckButton from 'components/content/checkButton/CheckButton'

import { mapGetters } from 'vuex'

export default {
  name: 'CartBottomBar',
  components: {
    CheckButton
  },
  // 计算属性
  computed: {
    ...mapGetters(['cartList']),
    totalPrice () {
      return this.cartList.filter(item => {
        return item.checked
      }).reduce((preValue, item) => {
        return preValue + item.price * item.count
      }, 0).toFixed(2);
    },
    checkLength () {
      return this.cartList.filter(item => item.checked).length
    },
    // 全选判断
    isSelectAll () {
      // 第一种方法
      // return !(this.cartList.filter(item => !item.checked).length)
      if (this.cartList.length === 0) return false
      return !this.cartList.find(item => !item.checked)
    }
  },
  // 监听事件方法
  methods: {
    // 监听点击全选按钮
    checkClick () {
      if (this.isSelectAll) {
        this.cartList.forEach(item => item.checked = false)
      } else {
        this.cartList.forEach(item => item.checked = true)
      }
    },
    // 监听点击去结算
    calcClick () {
      if (!this.checkLength) {
        this.$toast.show('请选择要购买的商品')
      } else {
        // this.$toast.show('请选择要购买的商品')
        alert('购买成功')
      }
    }
  }
}
</script>

<style scoped>
.bottom-menu {
  width: 100%;
  height: 40px;
  background-color: #eee;
  /* background-color: aqua; */
  position: fixed;
  bottom: 46px;
  left: 0;
  /* box-shadow: 0 -2px 3px rgba(0, 0, 0, 0.2); */
  font-size: 14px;
  color: #888;
  line-height: 44px;
  padding-left: 35px;
  box-sizing: border-box;
}

.bottom-menu .select-all {
  position: absolute;
  line-height: 0;
  left: 12px;
  top: 13px;
}

.bottom-menu .total-price {
  margin-left: 15px;
  font-size: 16px;
  color: #666;
}

.bottom-menu .buy-product {
  background-color: orangered;
  color: #fff;
  width: 100px;
  height: 44px;
  text-align: center;
  line-height: 44px;
  float: right;
}
</style>
